Resource utilization method of metallic nickel slag

Abstract

The invention provides a resource utilization method of metallic nickel slag, which comprises the following steps: adding molten high-temperature metallic nickel slag and smelting auxiliary materials containing basic components into an oxidation smelting furnace, oxidizing and smelting the high-temperature metallic nickel slag, and oxidizing After smelting, oxidation smelting slag and oxidation flue gas are obtained respectively; the oxidation smelting slag is sent into the reduction smelting furnace, and the oxidation smelting slag is reduced and smelted by continuously adding a reducing agent to the reduction smelting furnace. Smelting slag and reduction flue gas; water-quenching the reduction smelting slag to obtain water-quenched glass slag and secondary combustion of the reduction flue gas, and recycle the waste heat and secondary flue gas generated by the secondary combustion . The invention can solve the problems of insufficient utilization of slag waste heat resources in the prior art, high energy consumption, high cost, and S will also be reduced into the metal iron, resulting in poor quality of the metal iron.

Description

technical field [0001] The invention relates to the technical field of chemical industry, and more particularly, to a resource utilization method of metallic nickel slag. Background technique [0002] Metal nickel slag (hereinafter referred to as nickel slag) is the solid waste slag discharged in the process of metal nickel smelting. Usually, it refers to the solid slag discharged after the nickel sulfide concentrate is melted into nickel matte in a flash furnace, and the remaining molten tailings are then depleted by electric heating, which is also called depleted nickel slag or depleted electric furnace slag. The metal nickel slag is mainly composed of FeO, SiO 2 , MgO and other chemical components, roughly FeO 30-50%, SiO 2 35-45%, MgO 2-15, etc. The mineral phase is also dominated by fayalite and mafic olivine. In addition, the metallic nickel slag also contains a small amount of residual valuable metals such as Ni, Cu, and Co, and about 1-3% of S. High-temperature ...

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Problems solved by technology

[0004] In view of the above-mentioned problems, the purpose of the present invention is to provide a resource utilization method of metal nickel slag, to solve the current existing treatment process of nickel-iron slag, the utilization of slag waste heat resources is not comprehensive enough, and metal elements need to be recovered. Secondary heating, high energy consumption, high cost, and S will be reduced into the metal iron, resulting in poor quality of the metal iron, the utilization of the remaining tailings has not been fully considered, and the economy is poor, etc.

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